diff --git a/db/migrate/20171101102630_clean_up_duplicates_in_containers_tables.rb b/db/migrate/20171101102630_clean_up_duplicates_in_containers_tables.rb
index 7bc6254cc..762db62f3 100644
--- a/db/migrate/20171101102630_clean_up_duplicates_in_containers_tables.rb
+++ b/db/migrate/20171101102630_clean_up_duplicates_in_containers_tables.rb
@@ -39,7 +39,7 @@ class Container < ActiveRecord::Base
   end
 
   def duplicate_data_query_returning_min_id(model, unique_index_columns)
-    model.group(unique_index_columns).select("min(id)")
+    model.group(unique_index_columns).select("max(id)")
   end
 
   def cleanup_duplicate_data_delete_all(model, unique_index_columns)
diff --git a/spec/migrations/20171101102630_clean_up_duplicates_in_containers_tables_spec.rb b/spec/migrations/20171101102630_clean_up_duplicates_in_containers_tables_spec.rb
index fd7b98e99..04a981910 100644
--- a/spec/migrations/20171101102630_clean_up_duplicates_in_containers_tables_spec.rb
+++ b/spec/migrations/20171101102630_clean_up_duplicates_in_containers_tables_spec.rb
@@ -44,7 +44,7 @@ def build_value(key, foreign_key_value, string_value)
   def analyze(model)
     original_values = {}
     duplicate_values = {}
-    model.all.each do |record|
+    model.order("id DESC").all.each do |record|
       index = record.attributes.symbolize_keys.slice(*model_unique_keys(model))
       if original_values[index]
         duplicate_values[index] << record.id
@@ -64,9 +64,9 @@ def assert_before_migration_test_data(model, original_values, duplicate_values)
     expect(original_values.count).to eq(original_values_count(model))
     expect(duplicate_values.values.flatten.count).to eq(duplicate_values_count(model))
 
-    # Check that original values ids are the min or all duplicated ids
+    # Check that original values ids are the max or all duplicated ids
     original_values.each do |key, value|
-      expect((duplicate_values[key] << value).min).to eq value
+      expect((duplicate_values[key] << value).max).to eq value
     end
   end